In this case it wont work, beacuse after 1st cutscene there is another cutscene which trigger Ice Giant death, so doing the method I'll give You will cause giant stuck at 1HP making him unkillable. Also the 'boss hp' metter is missing, and there might be other issues related to 'back from dead'.
To the point now, basicly when you have ANY infinite loading like this, for 99% You'll die after a while beacuse the game is not stopped, and everything expect You is 'live'. To do this trick we need dev. debug console from nexus (I'm not going to post any links, at least search that by yourself) We have two cases with 'death menus'
1. We are already dead with loading/main menu buttons
2. We are stuck on black loading screen, and there is no enemies that might kill us
To do:
1.open console and use "resurrect()" command, voila. we are back into action with advanced game phase (just after that bugged cutscene) Like said this is causing issues, like dissapearing boss health meter etc.
2.open console and use 'playerkill()' command, after 3-5seconds you'll be dead and we are moving to nr.1 when we see the other panel.
Well and that's it pretty much all what I've found so far. I spent many hours searching for commands such as "forcequest move phase/update/complete etc etc" but nothing seems working. My all repair attempts are based on last fight-phase with Ice Giant, and like said in this case its not working beacuse there are two cutscenes, and even when I was doing these steps perfectly 'timed' like I've just watched the cutscene and the game is working normally, giant will stuck with 1% hp. And trust me I've tried EVERYTHING starting with spawning other creatures hostile to him, by changing locations, doing other quests, and ending with quest npc manipulations like 'friendly/hostile' etc. Looks like there is no way to fix it without cdp help, if we find and rescue Folan after we reached the cave with Hjalmar nothing will work to kill last boss. I'm almost sure its happening beacuse our bugged archer is already on the 'ramp' position next to giant, and he is somehow fucking with triggers (I dont know if its for everyone but when I was stucked on the first loading screen I could hear archer swing sounds, and its only sous from game expect music) When we would arrive to the cave for the first time (in case when Folan is not stucked, and he followed us normally on foot to the cave) we see the short cutscene when we move rocks with Hjalmar to clear the pass. After that our lovely legolas inform us that he will take that ramp position, without messing teleportation. I dont know how those two methods will be useful, but I just wanted to share just FYI.